classic doom the psx version on xbox series x

Pretty sure they're not using Vulkan on Xbox.

How they run depends on what console you're using. On Series X they're excellent, and Doom Eternal even has raytraced reflections on the Series X hardware. The RT can drop the FPS to just below 60 occasionally, but it's largely flawless.

On the now older Xbox One S their resolution is limited to around 900P, but they run much smoother and in higher res on the One X and Series X.

If you've got a Series X, Doom 2016, Doom Eternal, Wolfenstein II The New Colossus and Wolfenstein Youngblood play really well. No major performance issues. Digital Foundry on YouTube have conducted extensive tests on these games. I would check them out.

Doom Eternal Next-Gen Upgrade: PS5 vs Xbox Series X/ Series S - All Modes Tested

I looked it up on psn,

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they have DOOM Classic complete for $15, which is Doom classic, doom 2, and final doom.

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they also have BFG edition which is doom, doom 2, doom 3, doom 3 resurrecton of evil, doom 3 lost mission, all doom 3 content was re mastered in HD.

the price is $40 but I saw it $20 during black friday in stores.

Because on my Xbox series x, it only shows 'Optimized for series x/s' but if a xbox series x version of a game is NOT 'optimized' how would i know if I'm playing a series x/s version of a game?

Ok I have both versions of GTA downloaded on my series x the Xbox one version works fine on the series x I then downloaded the series s/x version on the series x I then launched the game and it gives the error message

NO! Unlike some games that have an Xbox One version that will upgrade to the the S|X version if you put it in a series X, NBA2K for S|X is a complete different version than the Xbox One version and it will not work if you put the disc inside of an Xbox One. Xbox One cannon run a Series X game and putting a Series X disc inside an X1 will not install the X1 version.